A fossil nitrate called caliche, used as a source of nitrogen, was first exported from which of the following countries?

Question

Quizplus · Accepted Answer

Chile is historically known for its large deposits of caliche, which were extensively mined for sodium nitrate (saltpeter) used as a fertilizer and in the manufacture of explosives. This industry was particularly important in the 19th and early 20th centuries.

A Fossil Nitrate Called Caliche, Used as a Source of Nitrogen